code: def try_to_guess_ref_keys(
      self, column_names: List[str]
  ) -> Optional[List[str]]:
      for name in column_names:
          if "answer" in name:
              return [name]
  
file_path: optimum/optimum/utils/preprocessing/question_answering.py
imports: import copy
  from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
  from transformers import PreTrainedTokenizerBase
  from .base import TaskProcessor
label_desc: Use image node_id 4 for calling the QuestionAnsweringProcessing obj's underlying member method code with example usage: obj.try_to_guess_ref_keys(column_names) and returns: list